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Current and long-term debt - 2023 $117.4 million credit facility (Details)
1 Months Ended
May 31, 2023
USD ($)
vessel
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 1,588,290,000 $ 1,436,224,000
Gross carrying amount      
Disclosure of detailed information about borrowings [line items]      
Borrowings   1,617,439,000 1,948,592,000
2023 $117.4 Million Credit Facility      
Disclosure of detailed information about borrowings [line items]      
Loan maximum borrowing capacity $ 117,400,000    
Borrowings instrument, term 5 years    
Periodic borrowing payment amount $ 4,300,000    
Net debt to capitalization ratio 0.65    
Consolidated tangible net worth $ 1,000,000,000    
Cumulative positive net income 25.00%    
Net proceeds of equity issuance 50.00%    
Minimum ratio for fair value of vessels 150.00%    
2023 $117.4 Million Credit Facility | Vessels | STI Battersea, STI Wembley, STI Texas City, STI Meraux, STI Mayfair, STI St. Charles, STI Alexis      
Disclosure of detailed information about borrowings [line items]      
Vessels pledged as security | vessel 7    
2023 $117.4 Million Credit Facility | Gross carrying amount      
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 108,890,000 $ 0
2023 $117.4 Million Credit Facility | Consolidated Liquidity Requirement - Scenario One      
Disclosure of detailed information about borrowings [line items]      
Covenant liquidity requirement amount $ 25,000,000    
2023 $117.4 Million Credit Facility | Consolidated Liquidity Requirement - Scenario Two      
Disclosure of detailed information about borrowings [line items]      
Liquidity requirement, per each owned ship 500,000    
Liquidity requirement, per each chartered-in ship $ 250,000    
2023 $117.4 Million Credit Facility | Secured Overnight Financing Rate (SOFR)      
Disclosure of detailed information about borrowings [line items]      
Adjustment to interest rate basis 1.925%